best available copn



Sept. 25, 1928. 1,685,344

' J. STUART, 2D

MACHINE FOR SECURING BRIDGE} WIRES TO LEAD WIRES OF ELECTRIC BLASTING CAPS Filed March 24, 1927 5 Sheets-Sheet 1 kS/aarif 2nd win-44b1, ATT RA t YJ Sept. 25, 1928. 1,685,344

' J. STUART, 2D

MACHINE FOR. SECURING BRIDGE WIRES TO LEAD WIRES OF ELECTRIC BLASTING CAPS Filed March 24. 1927 5 Sheets-$heet 2 F/G. 2. Q)

m m/vrofi mzwgss; I L 7% J if 4 ATTORNEYS Sept. 25, 1928. v J. STUART, 2D

MACHINE FOR SECURING BRIDGE WIRES TO LEAD WIRES OF ELECTRIC BLASTING CAPS 5 Sheets-Sheet 3 Filed March 24, 1927 13 4 Jfaaraf 2: 1

Alf/URMEYJ IY/TME'SS: W

Sept. 2s, 1.928. 1,685,344

J. STUART, 2D

MACHINE FOR SECURING BRIDGE WIRES TO LEAD WIRES OF ELECTRIC BLASTING CAPS Filed March 24, 1927 5 Sheets-Sheet 4 Sept. 25, 1928. 1,685,344

J. STUART, 2D

MACHINE FOR SECURING BRIDGE WIRES T0 LEAD WIRES OF ELECTRIC BLASTING CAPS Filed March 24, 1927 5 Sheets-Sheet 5 P76. /0. a f 490 x A! g o O I eaeoeaaeeeaeeeeoeo eeeeoeealeeeefiaeeaeeee u w I y c H I e l FIG. /5'.

mmsss; F1514 d I/VVE/VTOR W U L/ S6 A i/aar/ 2nd flw (4W Afro/M: rs.

Patented Sept. 25, 1928.

UNITED STATES PATENT OFFICE.

JOSEPHISTU'A'RT, 2D, or ILMI GTON, DELAWARE, ASSIGNQR TO HERCULES POWDER COMLPANY, or'wrmvrms'ron, DELAWARE; A CORPORATION or DELAWARE.

MACHINE FOR SECURING BRIDGE WIRES TO LEAD WIRES OF ELECTRIC BLASTING CAPS.

Application filed March 24, 1927. Serial No. 177,959.

In an application filed by me April 23,- 1927, Serial No. 185,951, I have set forth an improved process of securing the ends of a fusible bridge wire to the ends of two spaced apart conducting-leg or lead wires which extend into the detonator or electric blasting cap of ablasting charge. In this process notches are formed in the extremities of the the notches so as to extend between, or.

bridge; the lead wires, and the ends-of the bridge wire are welded to the eiidsof the lead wires while at the same time the metal of the conducting wiresis upset so as toencase the ends of the bridgewires. ='The parallel ends of the conducting wires are then slightly deflected into a convergent direction in order to bend'the bridge wire I The presentinvention coinprisesa machine for: performing the series of operationsset. forth in mysaid patent application and alsov other accompanying and. collateral operations whereby 'a number; ofv pairs of lead; wires may be embedded in plugs of asulfur compound or other appropriate material and whereby thebridgewires maybe welded to; the lead wires in rapid .successionfand in a manner: which. is as nearly entirely: automatic; as isdesirable. In the drawings; which. show a preferredembodiment ofthe invert-- tlOIlZl e -".1.-

Fig.- 1 is a side elevation oi the machined Fig. 2 isiaudetail viewof. the mechanism for welding",v cutting-and deflecting the bridge! Wire; j.

Fig. 3 isan enlarged detail v iewiot p51 bi} the welding, mechanism taken, on the line.

i v. ".i: iii-1 Figv tisla side view of-the bridge .wire feed.

carrier-and agpart otthe naincarriage on h chji s pported-.5 .;1 v. Fig. 5 is a horizont lcross-sectionthrough.

a part-of the-main carriage and a part of the bridgewirefeed carrier Fig. 6 is;a plan'viewof the front part of.

the bridge wire feed carrier. Y

Fig. 7 is a plan iew of therear part of the, bridge wire feed carrier.

- Fig.8-isa partial end view, partly in section, of the machine and: of the lead, wire die carrier cooperating therewith.

F lg. 9 is an elevation of the automatic stopping mechanism. 1 Q v.Figz-lOis-a plan view of the die for sup cuppingdevice for-deflecting the lead porting the lead wires in operative position. F 11 is an enlarged cross section through said die and another die that cooperates therewith to .properly position the lead wires and facilitate the cutting of the ends thereof.

Fig. 12 is a greatly magnified view showing the end of one of the lead wires with the bridge wire positioned preparatory to welding them together; and showing also part of tlie-weldingimechanism.-i

Fig. 13 is another magnified view showing the two wires welded together.

Fig. 14 is another magnified View of a pair of conducting wires and the bridge wire spanning them, and showingalsd the mouth of the bridge wire feed. I 2:1 r

Fig. 15 is another magnified View of the wires and bending the bridge wires;

Before describing: the; machine, sirable: tol.describe; in a ."gene ral' way, the series" of operations; that it performs in orderntliat' the subsequent; Z recital of the details :of construction .may be "clearly understood. 2.3; ;i'' .1. I The ends or anuinhen ofpairs of lead wires are insertedlinto a two Jpartidie; one .part of which isprovided with a number of openings through; and ibeyond which the-wires extend. Into these.- openingsj's-ppured' a; suitable ma terial zsuch. as'an appropriate sulfur loom-- pound-,1 adapted Jtmq'iiickly. harden. The ends oii zthe lead-,wire's projecting beyond: the sulfur .plugs extend through prific es, formed in the other part of the die, of a. diameter adapt ed. to containtheiwireshi'Byz means of an appropriatetool, the extremities of all the wires areflgrooved in 3 one. operation..- The. last named; part of the. die is -theiiremoved, leav-- jecting frointhe plugs: :2; 3

The bridge wirefis unwoundfrom aspool carried by a carrier which is movably mounting the-'uncoveredends of the leadlwires pro ed on a carriage. The carriage is adaptedto move progressively along thedie carrying therow of pairs of embedded-lead wires. The'bridge-wire carrier is movedto-lay the bridge and within'zthe grooves of two lead wires of a pair soas to span the. spacebetween them." Mechani'snristhen operated to first weld the extremity of the bridge wire to one of the lead wires and to then cut the bridge wire-adjacent to the other lead Wire, so as to leave a severed section of bridge wire bridg-- it as. a.-.

ing flielead iresqndweldedio one. of them The bridge;wire .,ca;rrier is then moved to innspool a short length of wire. The carriage then zrdynnred pg'eliininnrily to welding the bridge wire to; the other lelq'cl 'viir'ez This welding operation is then performed, immediztltrly a: which theleadyires are sli itly 'nent toward one :in other so is to hem" the bridge wire from a strnight line. {lfhe car; ringe is then advanced, thus completing the 1 eyelef operations; thenext operation being a movement of the-bridgeiwire carrier. to. lziy the bridge.wire-within thegrooves of the lead 'll-llilifid-lit} nextpniriof the series.

Y H e-wing. thus setjmgth;in iliongh .W-ay, the

1 general mode-f, operationof; the machine,

the: construction thereof will now be de.-: scrihechrn detail. :-;,i -'lo a (he a.(see Figs. l0.and 11), c0ntaining :1 row of cy.indrical holesicis appliedia' dieli containing a longitiichnallyextending groove r: and a series ofpdirS-of-orificeszh. Orifices (lieonne'ct the groove-einnd the holes '0 when the-die. plates are superposed. onempon th'e other-f as described,,there-beiligmpair of or-ifires (l connnunicnting with ealehiholec. The

hereinafter more partieul'arly described; it

' low. stand each .sid

lewd wires y. extendjhrouglrthe holes 0 'a'nd m-ifiees;. l .mid gray-project irregnhrr. tanres beyond the orificesidiintmth' groove c.- -i,'l.'.he:dies-a and b arinyelrt'ed fnom the p oionnd-fiispoured into. the holesrc, formingplugs 2 )vhiehz quickly aharden; leaving; the" lead wires: embedded therein, msishdwn in Fig. 1-1. The dies are then turned back into.

- the iposition shown iiniFig. lhiindiaz too'l g,

having rvsshapedclrtting edgest-liatiprojectsz mtothe. groove-e,-is pushed alo'ng-theid-ie b; severing the protruding ends ofthei-leaid wires y and forming V-vshaped groo'vesgin their (:2:- tremities;v the grooved wire being shown on-ta large scale in Fig-1121i; The-diebis. then removed: from die .-a;..1 vli ieh,' then ciirries the 1.)li|gs- 2. witlrtheir prbjecting lead wires'y,'as: showilvinuFig 14.2: P -r. 5 .1111? -1- -"i;= "a" Thedie azzis =proyided-with tivospuds f oir aizherebjflthe die isiadapted to engage nligningblocks h mid-z on t'he maehineframe 10, one pair of \i'hiehis' shown inFiiseif 2em;e.8.- :.-The= die-snppbrting means will lieing. desirable: a-t-this-point. to .ds'eribe the general construction-of the machine. See.- Figs. 1 ,-2 ,n ;n (l4 .1-.;, :1 T he fixedjframe lQwarrigis-thempright hol-= zn'ds l-Lnfml- 12: carrying between them. hxed rods 13 and. llg-on whiehjs slidabl i' sleeved the carriage. k. -.This: esirriegecarries: the a n ieehanism; thereinbefore .me'ntion'ed; for teed-mg tlleibfldgc wire, welding it to the leadwireseentt-ing the=bridge wire and bending the .lendwivires nndealso carries a 'pmi/lthdt engages wi hzufixedzretehet barrto niovethe ear-r age iisehfi-forward-step b'ystep in syncin'ullism with the other mechanical movements. .All thismevhanism operated from shzi ftstlfi and 1,6, the endsof v'vln'ch'rotzite in bcaringsin standards 11 and 12.

S p rted. Oath li. frame, is 3 ,11 9: t or m,'n1 i'(lhetriieenl the s hgilft. of fihe lii ofoi' :ih'd' the shafts 15 :in'dlfi is a train of ga'ims enclosed in hollow stander-(L1 1, (see lsp fiig T hegea'rs are of subh l 'l il l lh fi 'si'z'e :i'nd so m": ranged that .shajt 16 is driven at half the speed of shaft 15.

.-The'me':|ns forjnter'mittently moving carriage' is will now he described; Extending along u' frmn'e connecting. standards 11 and 12isn ra-te'h'et ib'ar liro'tedoii carriage 7.: is shell-crank lever 21,-the depending arm ofwi'hic'li cirrriesa pawl lever 9.2.adapt'ed to engagefratehet 20. 1 Through a block 23 on carriage kextnds a slidable rod-24operz'ible by a' canu25..on shaft 15. A spring- 26 connects=bloek23 ivith the short arm of'lever 21. The spriiig-swings'lever 21=in :One' direetion; While eiunithroughrod 24, swings lever 21 in the opposite-direction. Pawl 22 therefore isswungbaekandn forth. and thereby inter- 1nittent'ly{advances the carriage;

It-shbrddhere be noted that it. is desirable, at one or more po'ints :rlong the length of die a, to strengthen the die by eross-brzices (not shown); which: makes it necessary to interrupt-the row-pf holes '0 at one or inorei points," 21s, for e exmiiple;zan: intermediate point; as shown at: Figt 10 .therebj; providing two a'ligr'iing roivsgoi holes,'=the holes of each row": heirigquifemlosdone to iriotlier, while the adjoining-holes of! difierent i rowsare spaced apart a 'subst'antial distance; Each reci rocetory motion-inipartd-to'paivh22'hyeai 25 is? sufficientgto Inove parriage 5 k1" thronghdts niaximumgtmveljnani'elyga distzince-equal to: the 'dista'n'ce betii'eeii-themorenearly adjacent leg wires of adjoiningholes of different ron sb' Except':-=ho\\-'evefi, Wfliii the; nieehanisln p'or' ted- --'the e ai rihge'has operated bn t 1e last lg' wife the first r'owgzlndis about to operate on the first le wire of the second rep? thefearrihge shoel'cl'mdvqregi'ch time it is re: qtiiied to do only-a distance eqngl llto thedistgmce between the ends of "air of leg or t-he' distaiice' betweens j'a'cent reg wiresmf' adjaeem 'pl'r'irs of the saine roiy'." Paw] 22 is, therefore, noi'in'zillyirendered inobe'rp'tiye dining th greater-pert o its mi-mene an the d'i'reetien to-ad v'ance the earriagc by ridingpv'er 'gi'gnerd 27 (harr ed on' the-aide: :1- lev'e'r 28piVot'e'd' o'n' thctll riarge) which holdstli'e pawl bet-of operati ve relzitioii with meme-2o fibrin-pg the 'pgi'wl approaches the end olf-i'tsfih'ox -enint, its he yy end-oyerrides gnard 27", zin's'in'g it to operati'vely engage rz'rtehet 2 ()-:=nr c't=shifc the ear-' riage along thefr'iirne the desired distanceabove specified.

If, however, the row of 'h'ol'es bisinterrgupb ed at an intermediate-pointa'is shown in- Fig. .10, it is arranged, after the completion of the bridge welding operation upon the pair-bf lead wires engaging the last holes of the first series, that pawl 22 shall be operative throughout its entire stroke, in order to more carriage k a distance equal to the distance between the last wire of the last hole of the first series of holes and the first wire of the first hole of the succeeding series of holes. This operation is provided for by recessing, at a proper point 30, the Frame along which guard 2? slides so as to allow the guard to drop thereinto, in which lowered position it is inell'ectiye to hold pawl 2? inoperative,.so that the pawl becomes effective to shiftcarriage k the required greater distance.

' After the completion of the weldingoperation upon the lead wires of the lastseriesgof holes, the carriage is returned, preferably manually to its extreme left position. Duringthis operation, pawl 22,- sho uld remain outaof engagement with ratchetififl. Hence v the surface alongwhich. guardQI slidesshould be-uninterrupted. Io' provide such .an rmintcrrupted surtace, a,- rod- 31 is projected upward. Rod -31 carries. at its upper end an arm 32, the upper 'face of which, when the rod is raised, is broughtjonto a level with the-surface of the frame along which guard; 27 slides thereby preventingthe guard. fromiclropping into re-. cess 30;. The lower endpfi-od31 has a spring} pressed. head slidable in ;a bearing. the spring normally. holding mod. down a in; operativeposition; By' means'iof a pin 34 slidable ina slot in bearing-33,1the rod ina be raised aiid held raised. during the more.- nent ofcarriage k to the left.; ,C ar1:iag'e may.basemanually shifted by lne'a n s ioffla handle 35oirthat sleeve ofthe carriage. which plunger bearing radially ag ainst 1 0d 131ml p i g Press d a ins t ero iket fd sired frictional drag; This insures t be no oiz erthrow oiireboungl of the h,e Ii motion is inipartedtoitf; I i

I shall nowqdescribelthe means for: inter-'- initten tly unwinding the liridge wireandfintei-n'rittently feeding it to the lead Fi'gsL-T,

slide 0 carries a fixed jaw 46 and a movable jaw 47, the latter being a three-armed lever pivoted between its ends on slide 0. Wire 11:. in. its extension from spool 41, passes around a pulley 44 on carrier n, and a pulley 45 on slide 0 and thence through straighteners 42 and -13, between jaws'iti and and through nozzle4() 4 The jaw lever 7 has a very li nited movement on its; pivot. The end thereofopposite its jaw end carries a stop 48 ada )ted to en gage an abutment 4901; slide 0. .\Vl'!l(:ll limits the extent to which the movable jaw can recede from the fixed jaw.

' j As above statechcarrier 12 is vertically inov,- able on carriage [c.lts upward movement isellected by a spring- 52 (see Fi l)i wh;ich is confined between an abutment on a projection on carriage lq-and anuton the upper end of a rod 51, whose lower end is-secured 'tocarrier' =1 tsdownward; movementis effected bye cam-53:01; shaft 16. l ..I 3 -From thepivotof the. inovahlej aw lever 47 extends an arm carrying aroller 54 slidablein a cam. 55 on-.carriage]q. iAs :soonas carriage 2?. begins its upward n 'oy nent,, rolle1; 54; rides e o g ppewfi e t-han rWa l im-" x 15 n iswi gsjaw AZ $9 rel se h gr p of ei as on w x s-mlhis meveme flas above atML-is a ve y mited an by I Q the egaa menen $012 n hmbntm m 49,. bu itsnific s to r l a e the grip on th wire-1e: 1 awi ie i'nn inues i s pwardime mentninz fl U 1 )'?5 'i 'E =7 -Q=D.M i qll imlfi 2w wing, the necessary'fiect isit'of s1idQ thQ ide 0 yearwardire t x ttocarrier:an ilr' ewi et en'i ween .theiavireend: hestm g ten s i=2 and i 53: gr t rt uztheitric ie lfres tam iei the-wimtm e neemonnd .tmmith smol- Consmuen la the min t szbsldrs spm m w es as withi he lide, and by; iasonpifls. bid-1 y' m aement 9i. pe leyrle xel tim iml fiy. 4w d eite: engthei'aire sBerno li-from he. p 91.'- !-.!;-iuin him: a; e=.- e maard movemen iptzca 'ie i-a,

re lee fi eyks... ein ithelewee mi endovl sqfise i qli ihefirs Li ne pa te i -mov nt; J w Eiisswen eiwi ee' ndathe e fie s sesm ehie h e-jam we w sss is-rth s the-messes ec iiete sitanees i ee, s t. whens-er rier 'n returns to it on as shown in Fig. 4, slide o has al so ag g i zieedto its forward position,.iis ,sho'wn-.in 'thlsaine figure. The r p i-ha 7 and '1 w ll al b i a positive one, .whileytlie.engageinentfof the 1:aig f n!s 2- d- 3 g. n x fric: tion'al, thewire is pulled between the straighteners andffedthfougli nozzle 40.-.- Itis during this operation thatthe straighteners act to PQ EQI' h fW F-iQR- f' ;It;'1's necessary to provide nieans for pre renting; 5.00 free moveinentof slideo in the .rriei-','n1d Lha e shown such a ileyic'e at 29, l ig fl whijch consists of a spring-pressed iii iii

ife

plunger or brake shoe bearing against the slide, similar to the retarding device in handle for the movement 0 carriage k.

The sequence of the described operations of carriage a and slide 0 with respect to the movement of the carriage and to the operations of welding; clipping and cupping, will be set forth after the mechanism for performing these other operations has beeh described.

The means fdr welding, etc; will now be described; Reference. should be made to Fig. 2, and also to the somewhat diagrammatic views, Figs. 12-15.

The bridge wire as may be assumed to be resting in the V-shaped notches in the upper ends of a pair of lead Wires 3 See Fig. 12. It will be assumed that wire a? is about to be welded to and into one of a pair of lead wires 3]; Wire y is then clamped between two diametrically opposite member's-1' and 8, one of these members, 1', 'also'fufi'ctioning as an electrode. At the same time a third member p, which acts as the'other electrode, moves downward iipon the top of the lead wire. Member hasl ijtsend hemis herieally or otherwise eon'cavely recessed to embrace the walls of the notch in the extremit of the lead wire. As member '10 continues to move down italpsets inwardly the walls oithe noteh inthe head wire,e1nbed'cling the bridge wire therein, as

shown-in Fig. 13. Thi eforefaethe bridge wire-iswelded 't'o'the lead wire, it is at the sametime 'suirol'in'de'd by and encased in the metal tithe'leedwire;insuring-perfect electrical-contact therewith. 1 Y "The described movements of the-members p, rahd s"ar e 'efi'eeted by mechanism operated byeamsen shaft le -Two eraaes'e cams; Behind. '61, Wh'ieh' may be -'l iame'tricany oppositelyarranged on the shaft, respectively engage rollers on the endsof intermediately pivotedroekin 'i vers 62 in-(163, which areres'pcti'v'ely connected, by links 64 and 65, with blocks 66 and 67 sildable on the'ca'rliege. Block (id-carries electrode 4"; I Block 67"eairi'e's the backing clamp s, between which and electrode? the 'up'perend'ofthe lead wire is held du ringW he' welding thereto of the bridge wi're., It will'beclear-fromFi 2 that tiie'se'b1ocks are moved toward each other to advan'ce'clainps '1" and 8 and away fromeach other to retract these clamps. j HAtth'e'sar'iieZ'time "that'cam's and 61 are operating,as'described, to actuate clamps r afcam 7061i shaft 15 is ro'clring another rock le\ er71, which'depresses a frame 72 caifiying the electrode 7). The holder is normaliy' held j'ont 'of action by means of a s'pria-g 73. Electrode p has a limited sliding movement in its h'0l.der.72 (see Fig. 3), a spring .74 tending to project it but adapted toyield to allow to the electrode a slight l fn'jovem elit of retraction, and permitting a follow-hp action upon the weld.

By the mechanism above described, memtion' with, contact 81.

bers p, r and s are simultaneously advanced into operative position, and during the 0]) eration of welding and upsetting electrode p presses cndwise against the notched end of the lead wire, yielding slightly, to the extent necessary, against the pressure of spring 74. 'lhe electric welding circuit is not Closed until electrodes 7) and icontact' with lead wire 7/. This circuit is also normally held open :it the contacts 80 and 81. One of these contacts, 80, is electrically connected through wire 82 with the current generator 83 which, through wire 84, is conn'ectetlwith electrode 1'. The other of these contacts, 81, is elect-rically connected, througi'i wires 85, with elec-' trode p,'the latter connection being preferably made by clamping the wire between nuts threaded on the up er end bfthe electrode," that portion of the holder being electri-' Cally liisulated as indicated "at 76, Fig. 3. Contacts and 81 are, as before'stated, normaliy separated, but bv means of a cam 77 on shaft 15, a. slide bar ('9 is lifted and moves contact 80 against, and-into electrical connec- This mechanism insures that the welding circuit is closed when and only when its'operat'ion is required. Assuming that the bri'dgewire has been welded to one of the 1 :'ad'iiii es,the nefit'op eration is'to-,'se yerthe bridgeavii at a point just beyond preferably about has other lead wife. The mediaa i m for'so cutting or snippin' the'lbi'id e'f wiie"comprises shears one blade 5 of'ivhic" is "movable p'iv; ot ally on 'the .othei blade to effect; the illittin z' v'lh'efsiiea'rs memorable heaayeear the briilg'ewire'byfirie ansgpf metatarsal eo'n trolled by adam 9Qon 'shaft Thismeha ni's in compasses rock Tet-61 9mm a carryingthe fixed blade tpf the he shears fare rridyable 'away the s l 'ehifflh i fei f p mares a p ac dra ries ge -e by t is. se es? n a ara. env b w v Oh" 1 la e 95 'a vs ri'1'1'gf9'6 .w'vhich tend's' 'to' swing as 'ftl'to e ect the sheeting of the bridge wire. During .thedownw'ard movement of rod 92and theshears, blade '25 is held in the open position shownin Fig.9 by means of a spring-actuated dog'97 As soon, however, as the shears are moved fully down. a notch 98 in the shears is brought/opposite dog 97, which allows spring 96 to close blade t and sever the bridge wire. Atthistinie also a headed 'pin 99 on blade 25 just clears a pin 100 on plate 95 this clearance being also nee essary to allow blade t; to close: the high pointof cam rides beyond the 'rolle'r on the end of rock lever 91, spring 93 begins to raise the shear blades and pin 99 rides over pin 100 and opens blade 25*. At the same time notch 98 rides out of engagement with dog 97, the actuating spring of the dog permitting the dog to swing slightly to allow this disengagement, blade t thereafter bewith, are

ing held open by dog 97, the latter functioning' to continue to hold the blade open while notch 98 is riding over pin 100.

The next operation is to move the carrier 11 upward and to the right (Figs. 1 and 4) in. order to unwinda length of bridge wire a from its spool, as previously described.

The next operation is to advance the carriage k, that is, move it to the right, Fig. 1,

in order to bring the welding mechanism 1', s, 2) etc. into position to weld the brid e wire a: to that one of the lead wires 3 which adjoins the just severed endof the bridge wire. The welding mechanism is then again operated in the way previously described.

The next opcration involves the bendingof the lead wires 3 y from the parallel position shown in Fig. 14 into the converging position shown in Fig. 15, in order to bend the bridge wire into the shape of an are or a Very shallow V. as shown iirFig. 15'; thereby preventing subsequent breakage of the bridge. wire due to expan'sionor contraction. This is et- 4 fected by means of a cup-shaped former u.

4 The inner diameter of the cu at its rim is slightly greaterthan the distance between the two wires plus their diameters. The wall of the cup is of-frusto-conical shape,'eonverging toward its closed end. Bymoving the cup in the direction of the axes ofthe two wires 3 the wires are bent into the position shownin Fig.15; .Q g

Cup u is carried on tlie end of'airod 112, which is moved downward; at aQpr'edetee mined time by means of a rock lever 111 ac tuated by a cam on shaft 16. Rod 1 12 is move upwar'dby means of a spring 113 be tween a'collar 1140s the rod and a bloek 115 iri'whiclrthe rod slides; I e i "flfhe neiitoperationfis to move carriage I: to the right to bring theiwelding. mechanism into operative relation with the firstlead wire 3 of -ns'xtl'pa o lead ir''s; .B fei' We s h w v r .c' rierfl is ieY fiqi i nd to the t (F gs l i dj lft fs yi n's'r f e i ly de scribedg. advancing"thjgripper 4H7 and laying the'f orward end off the bridge wire overthe' ends of the two lead wires and into the notches thereof. Y

This completesihe cycle of operations. Other detailsof the inachine,- liowe ver,i remainto'be described; p

It has been stated that die ais provided with spuds f adapted to beengaged by blocks h and i on theinaehine'frame. This engagement. very accurately positions thefdie'so to insure that the lead wires will he in the exact position required'to enable "t-hegdescribed series of operations to be successfully .per-

= formed. The blocks h and are positioning means rather than supportingmeampthe die being independently supported means of standards 121which engage pins on the ends of the die. The standards are carried on atruclc 122 (see Fig. 8) provided with wheels 123 that roll on rails 124 on another truck 125, the upper part only'of which is shown in the drawings. Truck 125 is adapted to travel at right angles to the direction of travel of truck 122 so'that the die may be moved by track 122 parallel to its longitudinal direction of extension and then at right anglesto its longitudinal direction of extension to effect the final positioning of the lead wires on the machine.

' Two of the blo'cks (z') are in fixed position on'the machine'fran e'. The other two blocks h are carried on the ends'of arms 130,,which are eapable of being moved laterally and then downwardly from thief'positionl shown in Fig. 2'to'enable the die it toYbe moved transversely into its operative position'and of being then moved upwardly and laterally-(or in' 'directions opposite to those first specified); to efiect engagement of those of the s'pu ds that are intended to'engage blocks To enable this operation to be etfectedg-arms are carried on nonmembers-"131,- whi are prbvisied driven froma worm'on a'sliaft It is preferred it"o" p'erformfith operation iiia'nua'll'y and therefOre shaftif 135 is' provided with, a ha'ndl'ey136 tuihihg shaft 132'siflfieien tly to; impart the rottitiiinfto caa1s'13'3; arm's fl30 are' ir'idyed to'ithe'left, 1F i 2, to're leas' bloel'is @frbm th'spuds rgaaafi aaawa: B a other-Jerifermionrease133 arias 130' as;mediumst eme re. o batck It isd'SirzibIeIo 'aiitojfizitiall I 'p ch ne itb' 7 1i 0 l bffl fq on thila's'tpairoffleati I R'iQrYin'g' to Fig'i9': D's-venfroni-s'liaftt I6"is-a'srisfo ref ducing gears 140, the last of which cgrries'a notchedf wheel or 1isc 141 whicl makes one eonierce revolution 'aumr mar aritas of cemegekaong die'aLf'Durin "themserp the carriage; the geeit wrong; are new that drives aieisame is biased t-hifough a: switcl' arms "144*," which I springgtensi onedile ver 142; The latter is he] d in arena-closi pbsieqn,=qggiiasi thepu1i 'of its spring, by a projeetion' 143 thereon riding along the peripheryofdi'sc'l fiw When, how ever, carriage k reaches the osition beyond which no further movement as required disc 141 is brought into position to caiisezleverl4t2 tobe actuated by its spring to snap. projection 14-3 into the notch :in disc 141,; thereby sepa": ratingthe switcharmsl tt and opemngrthe circuitfto; the motor,,' 4

Ha vin g now described the on the 'iiti ii -die is inverted to occupy the position shown in Fig. 11 and the ends of the lead wires projecting beyond orifices d are cut off and notched.

Die 1) is now removed. Die a, during the preceding operation, is mounted between standards .21 on truck 122 (see Fig. 8). The latter is movable on truck 125 until the spuds on one side of die a areimmediately oppos te blochs Truck 122 .S then moved to engage the spuds on oneside of diea with bioqlis Shaft 132 (see Figs. '2- .and 8) is then turned to move arms 180 up and then to the right 2) so as to engage block [2. with the spuds f on the other side of block 2' ther by exactly positioning the leaf wires to allow the proper operation of the machine thereupon.

The carriage 7c, is shifted to its extreme loft-hand position, Fig. 1, by meansrof the handle 33, This brings the carriage to a point where the welding mechanism is positioned to the left of the first leg wire -and spaced therefrom a distance equal to the ime .b w' nfib ad a nt g ir s fera r- Th tar m s tio my e mte e y eated by providing an abutment forthe carriage to strike at the left hand end of its travel, Fig. 1, andI have shown acollar Set screWd to shaft 15 for this purpose. Le ver 142 (see 9) is then lifted to disengage it from nQtehed diSc :141 andhe ldjinto position to close' 'the switch 14A, therebystarting theJin tQr Aftei the ;mach.i ne has started,'.jleyer 1&2 is released and s held in ciruit-elosing position by .the'smooth face of de m-,1. it. I The: first operation of the machinei is ,to move thelearria e to align the weldingm echanis n .withjthe rsti'o g wire of the first row. The nextoperation is to move carrier nldo vn on carriage 7.: (see Fig. this beingeffected by oam 53 (see Fig. 1-) on shaft 16. In the downward movementof carrier n, jaw 4-7 is swnng to'gi'ip wire .g;, and slide 0 is then .advanced (to the 1eft)in -to.positi on to feed the bridge wire x through nozzle and lay it over the first pair of lead wires :1 Atthe same timeth-e wire is pulled between straight- (mers 42 and 43.

Cams 6O jand 6-1 (see Fig. 2) onshaft 1-5. through the mechanism actuated thereby now advaneese'lamps 1' and s: and cam 70 on shaft 15. through the mechanism actuated thereby. advances electrode p. At the time, cam 77 on shaft lifts slide bar 79 and closes switch 8081 (Fig. 2), thereby closing the welding circuit. Thereby the bridge wire a: is welded to the first lead wire of the first pair of bridge wires. I

Cam 90 on shaft 16, through the mechanism actuated thereby, now operates the shears tt to sever the bridge wire at a point just beyond, preferably about flush with, the second lead wire of tlie first pair.

Cam 53 on shaft 16 now retreat-s to allow spring 52 to lift carrier 12 (Fig. 4). In this movement of the carrier, jaw 47 swings to release its grip on the bridge-wire and slide 0' is moved ,to the right, thereby unwinding a length of wire from spool 41 .Cam .on shaft 15 (Fi n l) uQ-w aetuates pawl 22, and carriage 7.: is s lifted to the right to position the welding mechanism 131th ete, preparatory to operating it to weid the severed end of the bridge. wire to the second wire of the pair of lead wires. V

Cams and 61 and cam now again move the welding nechanism into operatiye position, cam 70 efiiecting the closing of the welding circuit as before 'iand the severed end of the. bridge wlire is welded to the .secondjwiife of the pair of'lead Q I Cam 110 pn shaft 16 now e ects the downwardmoiieiiient of cap u to 'de eet the two lead wires intoa relative-1y convergent position, there bending-the bridge .'.wire, as shown in Fig. 15. i '7 Cam 2. p eit' 1.5 w re i es 'atesr iwi 22 and movesthe carriage to the right to posi tion the welding .meehanisn r, s, p, eteQpi-epa rato ry to operatingit to iweld the Bridge wir .to the firstwfire of the second flmir of e Wir Th ri e' t eeaweed mean t er imee we-s me i down on carriage): to l'the. and f ed i hrou h ,1 l' iir m'nt e vveiheseapggparib l dfli'iife l -n wer ghee-s mma y. an pe 'i ii i ec 5; i e' etiT' ti eefe welding m eiiisiit; 3 r i t -s ifi ng me an smafiaalee-me. eflee ignpeation, byf'theirgaetiuitjng, 4 s ib e: w I ..r tl i tebditha 'ini a li case the retraction occi rs,'in1me at elyga fter the mechanism performs i ts desei'ibed'bpei'a tion. t IQ- 2 9f dge hi e -fir lie-s s tioned in the die a, as shown. 1 O,;tli e distance betweenthe eent-ersof La mmf lead or leg wires is less than distarieehetwen adjacent lead or legwires of adjacent pairs. Consequently, carriage k'shoul'd be ady'rau'ced, along one row of bridge-wires not'iuiiform distances step ,byl'ste p, but distances which are alternately longer and shorter. Thisoperationis effected by .providingY-the ratchet 20 with teeth that are alternatelylonger and shorter. Preparatory to moving the carriage a shorter distance, the pawl 27 engages a longer tooth and has ace'rtain amount of lost motion before it operatively engages the ring'sfis hit as; 1

iii)

tooth, thereby moving the carriage a shorter distance than when the pawl engages a shorter tooth.

The 'machine is capable of operating not only with accuracy, but, with great rapidity. The welding of the bridge wires to the lead or leg wires is much more dependable than tl c'operation of soldering, and the additional operation of en casing the ends of the bridge wires in the metal of the lead wires makes. the connection an absolutely secure one. The importance of providing a surely permanent bridging of the lead wires canhardly be exaggerated, since the detonation of the blasting' cap of the blasting charge should be effected with absolute certainty. My machine possesses nun'ierous other advantages, among which {may-be mentioned the "avoidance of wasteof bridge wire.-

Having now fully described my invention, what I-elaim and desire to protect by Letters Patent is 1. In a-machine for securing a bridge wire between the ends of the lead wires of a detonatoif, in combination, mechanism to'weld tli'e'bridge-wire to, and encase it in the metal thleleadfiwires, and means tomove said mechanism into and oiit of operative position.

i machine forsecuring a bridge wire between the ends of the lead wires'of a dotonator, in, combination, means to feed the bridge wi re 'into position over, and spanning -theefidsoi,,tli'e lead wires,'and means to weld the bridge wire to, andl encasejit in the metal 'oflfthejends of the lead wires.

3 a machine for securinga bridge wire between the ends of the lead wires of a detor in combination, an electric welding circuit electrodes'int-he circuit, and means to positionthe electrodes to cause the current t' *passitlirongh the junction ofa' lead wire the, wire, said' in'eans adapted to move b'ne arena electrodes toward the end of the lead e and upset: the rrie tal'the'reof to e asith ildgewire thereinsnb st antially 'sim'ultanebh'sly with the welding operation.

4; In a machine for securing abridge wire 'between th e'ends of'the lead wires of :zfdetjmia tor, in combination an electric welding oircijit, electrodes in said circuit, clamps between wliichja lead wire is adapted to be conffiiied, one of said clamps acting as a electrode, an electrode movable against the end of a lead wire lgind means to move said electrodes and cla'mp's into and out of'operative position.

5, Ina machine for securing a bridge wire bet'ween'the ends of. the lea-cl wires of a dotonato fl n combination, means to weld the ends of the bridge wiretmand QUIZ-PS9 it in the iiietalof, the ends or the lead wires, and a device, movable in the longitudinal direction of extension of the lead wires, ai'lapted to engage the'ends thereof and bend them toward ear-h other sufficiently to Email, the bridge wire away tr'oiu straight position.

6. in a machine for securing a bridge wire between the ends of the lead wires of av detonator, in combination, means to feed a bridge wire into position to extend from the end of one lead wire to and beyond theend of the other lead wire, means to weld the bridge wire to both lead wires, and'ajcutter adapted to sever the bridge wire at a point adjacent the latter named lead wire 7. In a machine for securing a bridge wire between the ends of the lead'wires'of a d (-tonator, in combination, means to feed a bridge wire into position to extend from the end of one lead wire to and beyond the'jeud of the other lead wire, means to weld the bridge wire to the two lead wires 'su cce's ively, a cutter adapted to sever the'brid ge wire at a point adjacent the second-named lead wire, and means to' operate the cotter between the two specified welding operations.

8. In a machine for securing a bridge wire betweenthe ends'of the leadf wir'cs of a deton ator, in combination, means to feed a bridge wire into position to extend Trom th'een'd of a one lead. wire to and beyond the endiof f'the other lead wire,inean"sjto weld thebridgo wire to both lead wirs, a ciit t er 'adajit c'd' 'to sever the Mid e wireizit' ii fpoii'i tiidjaeeti't the latter named' cad wire, andaaeaeeyepn abIe aftertheiveIdiii and ciittihg bfirat-ioiis, adapted to .agage'ii'iwead wiias nia taaa them toward each other t'o'e ffe c t ab'ndlngof thebrid'ge wire. f"

9. In a'machi n'e ifor sewn-rig" bridgelwiie between the ends of the lead wires of weeronator, in combination, iiiiiaiis to sii port in series o f'pairsbf lead iiii' sfine'aii's't teed 'the bridge Wirei'nto o'v'eii the ends of, the: leadwii'esof flair, welding iiie'ch'a'hisni aaaetawwnd' the bridge when; thefpa sofl'eail absentee-sewer 'a ca'rri ag eifor th weldiii" ifiehiiiiisr'iii liieans to intermittently avarice-alt'eirnsmwpoea tion the waitin -mechanism; and-rat Qii'ei able afie'rea'ea of ti'tiniflgsfib ihbv thew'el dingiiiiacha'niiii -'()'i1 l; fiio' "rati've'r'lation with lthewifes' tans welded ,10. Inamachinc'forseci ii ng'a" itlg'ivi'ife bet-ween theiids o'f tli" lil, i i 5 1 m rror,- in con'ibin'zition, p It series of pairs OfiIe'a'iI'i vrres, \veldiiigirichanism adapted'to iiecessiveiy iv'l'd-diffi''ieiit sections of a: bridge wire to s iic'c'essive pairs of lead wires, bridwire 'd iiig'jinecl'iii ni l a' carriage the welding i fiechiiiiisrh and the bridge wire cedingmechanism, and mc'ans'to intermittently "advance the teenage.

11L In a'machine for securing a.- briage ire between the ends of the lead wires of 33in: ouator, in combination, asu'pp'ort for aseries of pairs of lead wires, welding mechanism adapted to successively: weld, different sec tions of a'bridgewiret'o' the dil'"ient 'rs'of lead wires, :1 carriagc'foifthc lding' nech anism, means tointeritiittehtly moi'e th? caniii riage position ,the welding mechanism, menus to move the welding {)QCCllQIIiSLU, when so positioned, into and gut e f pperz rtive runtion with the wires to be welded, a bridge wire cutter carried by the enrriage, n ieans to arcinate the cutter, i1 bridge .ivire feed and inezins to operate the some intermittently to position the forward end of the bridge n'ire, Rftiffil section thereof has been severed, relntive lfy to a pairof lead wires. i

12. In a, ngrehine for seourin'gn bridge wire between the ends of the i res of 1; .e ei onator, in combination, :1 s11 pp'ort i'or a series of pairs of lead wires, p, brid 'e fwire feed, inechanism adapted to ,welddi 'erent sections o f n bridge wire to difi'erent airs of lead wires, .a Cutter for seyering .su ecessive 'sections of bridge wirggrearrigrge snfporting the W l ng. me ham m n i tter, mean 1' .1- termittently now e the carriage .fand ,ep'ernte the bridge wire feed; welding 'rneehanisni and cutter 'to position sectionsofbrid e Wife reletively to suceessiw Pairs of lea wires {and alternately therewith .weld andliseven 'sneqessive secti qnsof bridge wire. f ;In,:rn gieliine[for seeuririggi, bridge wire tw nt' end i he i ed i i ze b' F etmate-3 'e e om efinned ,fe P n ng .e -eer e q Pi of l d Wir ii i sin e men P br z'iviitejfe i e e ise a ap ed toweld ce s e ee 'en n ebir 'd w r ifee l eess r -R$$9lfld=ii we? for severing successive sections of bridge w r 'eer e u e ie the w i me he mm t and brid w' r i e n-eed {IXQZIQSJQfiQgUQQtiQllY (werntQ the bnid ge ngire -tbibr ngee n ibr -Wire.ietoi p: ra-tir -e1ens ;.-w fihe;m .t dfile sl Wi e 1 e r-m t ieml in zmee e iem ea elileee eed we t en -lan e Wi TG=QQ P mQD Q il? cut e t iseye aeeid in-- f=b id ire, .m ve he e rie e p re e-fi ew lsl gm hr i F A', are d.-, -he.- hewi e t eir [bri e wi e wet leeensiimore he ear-fla e- &- ln a meeh ne i .se r i gb d e wi etween the end 9 the: wi tel ifi -r =tr,-' inet n eenslt'. pP9r 1- seri -Q p i -Nak r e e bril Wire e y eldingzm qhe s l a ted e ve d' h b idg w r th aslovi Qw' ie e r yg th b idg W r ee and W n mech nis n, -zr fren e on ,whielrthe earriageis slidabl hefisel n w i h ws 'eeei able, a pliz t hefie n -.m r w t fi e q ie e m n to r ta ha s, and 1 neans,dp erable from different earns ,to i ermit nt y-mer the. e ia eP-ei' the bridge wire feed end n-ctnatejthe melding meehanism- '15. In a, machine for seenrin a bridge wirebetweemthe ends of the leediwires ofa detonetor, in combination-,ineens-to support a series of pairs of; lead wires, means; to feed thmbridge wire into position to bezwelded to the lead wires, mechanism to weld the bridge 17. In enmchin'e for seeu'rin'ge brid e ire between theends of the lead'jvir'e'so onator, in 'cornbination, lea'd Iwire s'uiili jift ing means, .21 bridge virefcarrier pfin'g J ws; e d. a bridge w re lfihrqsint fieeln operable in one direetion to griplthe i upon the bridge wire and feed seine 'the lead wires zi'nd operable initl ie 'o'tlie r diree; tion to unwind alength ofibjri' ge ire" mm the spool and'WiresStra igl tneispivote' be} thsi rz-e ii e-ieeee te net e e e 3 ri e P98, 61 1 iren e- .-sf e ih iM newitfiie en el ee i el h ewi h et infi w i m. eeilfiie eee. Ramme ingn row 0 f1ea. '1r,es, n. carriage nn tomove it. intermitten tly along. the row of. lezid W 4i.- dg r e 'ee z ii ed seleng the row of'lezr i, Jfoht'firnitteritly inov e saidic'girrier gddiin ionf earrizige, and n eensiiiietnimle in the .VeftiCdl movement iof the arrier to ie d bridge wire into operpitiye relation with'lp airs oi' lee'd wires. v

20. In a machine for senr'inge bridgeyiire between, the ends of lead wires. of detonitor, in eombination lnez nsffor' supporting .a row Gilead.wireghkerrie e and n'ieans to move it intermittently 1mg t ero'jw of lead wires, a bridge. Wire carrier-extendin; along .the ,row of lead 'WiIiQLS, II 1 QI 1 S tO intermittently m0 ve said eerrierllp end down on said earriage, a slide on said ,eaifrier,.tw0

jaws carried by said slide, one of said jaws being movable into and out. of gripping relation with the other jaw, and cam mechanism operable in the movement of said carrier in one direction to first swing the moi-'- able jaw into gripping relation with the fixed jaw and then move the slide to feed bridge wire into Operative relation with a pair of lead wires.

21. In a machine for securing a bridge wire between the ends of the lead wires of a detonator, in combination. lead wire supporting means, a bridge wire feed carrier, grip p'iigjaws at ,one end of the carrier, a bridge wire spool on the other end of the carrier,

'two'sets of wire straighteners between the jaws and the spool, the two sets of straighteners adapted to frictionally engage the wires 'with pressuies operating atright angles to each other, means to move the gripping jaws away from the straighteners to feed the bridge wire to the lead wires and pull the same through the straighteners, and means tOPllll. the bridge wire between the straighteners and the spool to unwind a length of bridge wire from the spool.

22. In amachine forsecuring a bridge wire between the ends of the'lead wi'res of a detonator, in.conibination, lead wire supportin" means, 'a' bridgehv'ire feed carrier, :1

bridge; wire gripper and a bridge wire spool ontlie'carrier, wire straightening means between the gripper and' spool adapted to frictionally engagefthe bridge wi're,'means to move the gripper to feed the bridge wire and pull it through the straightening means. and ineans to pull the bridge wire between the straightening means and the, spool to unwind a leiigth of bridge wire from the spool.-

23;In a machine for'seeuring a bridge wire ,vbetwcenlthe ends of the leadwir e's of a detoiiator, in combination, means for support ing a row' of lead wires, a carriage and means to moyeit. intermittentlyalong the rowof {lead wires; a bridge wire earrier eiztending along theirow'o f leadjwires, means'to' i'n'ter-' mittently more said carrier up and down on being movable-into said jearri aws carried said 'slide oiie of said jaws d out of gripping relation with the otlier aw; a spool on the carrier adapted'to hold a" reel of bridge wire. cam

.ineclianisn operable in tlie movement" of said carrier in one direction to first close the mov-' able jaw and then advance the slideto cause said jaws to feed bridge wireint-o operative relation with a pair of lead wires and operable in the movement of the carrier in the other direction to open the movable jaw and .then retract the slide, and meansoperable in the retraction of the slide to unwind a length of bridge wire from said spool. I a

24. In a machine for securing a bridge wire between the ends of the lead wires of a (let- (meter, in coiiibinetio i, means to supporta aqeita slide on said carrier, two

series of pairs of lead wires, means to feed the bridge wire into position to weld successive lengths thereof to the lead wires of succrssive pairs, a Carriage and means to intermittently move it along the lead wires, an JiIH'i-I'OdG movable toward the end of a lead wire, clamps movable in opposite directions into engagement with opposite sides of a lead wire, a rotatable shaft, cam-actuated mechanism operable by the shaft to move the clamps in unison against the lead wire, cam-actuated mechanism operable by the shaft to advance said electrode,'and an electric circuit including said electrode, said electrode and clamps and their actuating mechanisms being carried by the carriage and movable therewith in its intermittent travel. 1 .7

In a machine for securing-abridge wire between the ends of the lead wires of a-detona'mr, in combination, means to support-.a series of pairs of lead wires, means to feed the bridge wire into operative relation with the lead wires. an electric welding circuit, welding mechanism includingelectrodes-in said circuit, means tozadvancethewelding mechanism into position-to'weld the bridge wire to the lead wires, a switch insaid circuit, and means, operable concurrently with the means 'to advance the welding. mechanism, to close said switch. 1

'26. In a machine for; scuringa'bridge wire between the ends of the leadwiresof a detonator, in combination, means tosupport a row of lead wires; a carriage movable along said row, means to movesaid'carriage step by step distances equal'td the-'distancest'between successive lead wires, mechanism "to weld 'a bridge wire'siiccessivelyto-the lead wires. m-echamsm Jfo'r "severing" the bridge wire between successive -pairs l ofleadwires,- two shafts, cams "oi'i'one shaft adapted to' mechanism. 1 z i 27. In iii machine forSe'euriiiig a -bridge ire between the-flendsgif the lead wire's of a detonator, in combination; means=to support a row of lead wires, a carriage movable along said row, means to move-said carriage' step mechanism for bending successively? thes as.

cured bridge wires, two' sh'afts, cams onone shaft adapted to actuate the carriage and welding mechanism respectively;- and cams on the other shaft adapted to'actuatethe bridge wire severing mechanism' and 'the' bridge wire bending mechanism. successively. 28. In a machine for securing a bridge wire between the ends-of the lead Wires of a detenator, in combination;marinatesupport relation with the other row, and means whereby said device may be rendered inoperative during the return travel of the carriage.

35. In a machine for securing a bridge wire between the ends of the lead wires of a detonator, in combination, an orificed plate adapted to support a series of lead wires, a machine frame, mechanism thereon adapted to secure bridge wire to successive pairs of lead wires, spuds on opposite sides of the plate, and centering blocks on opposite sides of the plate with which said spuds are adapted to engage, one of said blocks being laterally movable.

36. In a machine for securing a bridge wire between the ends of the lead wires of a detonator, in combination. an orificed plate adapted to support a series of lead wires, a machine frame, mechanism thereon adapted to secure bridge wire to successive pairs of lead wires, movable means adapted to support opposite ends of the plate, and means laterally engageable with the plate to accurately position it relative to the machine frame.

37. In a machine for securing a bridge wire between the ends of the lead wires of a detonator, in combination, an orificed plate adapted to support a series of lead wires, a machine frame, mechanism thereon adapted to secure bridge wire to successive pairs of lead wires, centering devices on opposite sides of the plate and complementar centering devices cooperating therewith, a rame supporting one of said complementary devices, and means to move the last named frame laterally and vertically to allow the plate to be positioned 38. In a machine for securing a bridge wire between the ends of the lead wires of a detonator, in combination, an orificed plate adapted to support a series of lead wires, a machine frame, mechanism thereon adapted to secure bridge wire to successive pairs of lead wires, centering devices on opposite sides of the plate and complementary centering devices cooperating therewith, a frame supporting one of said complementary devices, supports engaging the ends of the plate and adapted to move the plate laterally to efi'ect en agement of one set of centering devices, 311C means to move the last named frame vertically and laterally to effect engagement of the other set of centering devices.

39. In a machine for securing a bridge wire ing mechanism, a driving motor, an electric circuit therefrom, a switch in the circuit, and means operable from the driving means to open said switch when the carriage reaches the end of its desired movement.

40. In a machine for securing a bridge wire between the ends of the lead wires of a detonator, in combination, lead wire supporting means, a carriage movable along said supporting means, bridge wire feeding means, welding mechanism on the carriage adapted to weld bridge wire to successive pairs of lead wires, driving means and mechanism operable thereby to impart a step by step movement to the carriage and to operate the welding mechanism, a driving motor, an electric circuit therefrom, a switch in the circuit, reducing gearing operable from the driving means, and means operable from the reducing gearing to open the switch when the carriage reaches a predetermined point in its travel.

In testimony of which invention I have hereunto set my hand at Philadelphia, Penna, on this 8th day of March, 1927.

JOSEPH STUART, II. 

